Physical and Chemical Changes

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting, freezing, and mixing.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and changes the composition of the substance.

Front

What is an example of a physical change?

Back

Melted candle wax is an example of a physical change because it can return to its solid form.

Front

What is an example of a chemical change?

Back

Frying an egg is an example of a chemical change because the egg transforms into a new substance that cannot return to its original state.

Front

How can you separate a mixture of sand and iron filings?

Back

You can separate sand from iron filings by pulling a magnet through the mixture, as iron is magnetic.

Front

What happens to water in puddles when left in the sun?

Back

The water in puddles evaporates when left in the sun, turning from liquid to vapor.

Front

What evidence shows that frying an egg is a chemical change?

Back

The egg is now cooked and cannot return to a raw egg, indicating a chemical change has occurred.

Front

What is evaporation?

Back

Evaporation is the process by which liquid water turns into water vapor, usually due to heat.

Front

What is condensation?

Back

Condensation is the process by which water vapor cools and turns back into liquid water.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that retain their individual properties and can be separated by physical means.